It's not about edge. My children are free to make up their own minds about what they do with their lives when they reach an age where they can reason for themselves. Until then, I do my best to keep any ideological or religious influence from trying to exert itself upon them.
I don't think 'Be nice to others' is ideology. It may be part of an ideology, but I don't think that it an ideology in itself.
'Be nice to others' is also not a totalizing idea in the same way that Christianity is - not everything in the world happens because somebody was or was not nice to others. Christianity takes as its base that everything is/was the will of their god.
Narnia is only an "ideological or religious influence" if you're already very familiar with Christian symbolism. 99% of children will never get the references.
